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Optical Engineering

Correction of beam wander for a free-space quantum key distribution system operating in urban environment
Author(s): Alberto Carrasco-Casado; Natalia Denisenko; Veronica Fernandez
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Paper Abstract

Free-space quantum key distribution links in an urban environment have demanding operating needs such as functioning in daylight and under atmospheric turbulence, which can dramatically impact their performance. Both effects are usually mitigated with a careful design of the field of view of the receiver. However, a trade-off is often required, since a narrow field of view improves background noise rejection but is linked to an increase in turbulence-related losses. We present a high-speed automatic tracking system to overcome these limitations. Both a reduction in the field of view to decrease the background noise and a mitigation of the losses caused by atmospheric turbulence are addressed. Two different designs are presented and discussed, along with technical considerations for the experimental implementation. Finally, preliminary experimental results of beam wander correction are used to estimate the potential improvement of both the quantum bit error rate and secret key rate of a free-space quantum key distribution system.

Paper Details

Date Published: 22 August 2014
PDF: 8 pages
Opt. Eng. 53(8) 084112 doi: 10.1117/1.OE.53.8.084112
Published in: Optical Engineering Volume 53, Issue 8
Show Author Affiliations
Alberto Carrasco-Casado, Consejo Superior de Investigaciones Científicas (Spain)
Natalia Denisenko, Consejo Superior de Investigaciones Científicas (Spain)
Veronica Fernandez, Consejo Superior de Investigaciones Científicas (Spain)

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